MOLLUSCOUS ANIMALS. 
117 
FUSUS ANGULATUS. 
Shell ovate, acute, smooth, rather solid, brownish white; the spire elongated, rather longer than the 
mouth and canal; apex blunt; whorls convex, rounded, with five or six sub-equal narrow elevated spiral 
ribs. The mouth small, roundish-ovate; the canal short, rather twisted, open. Length 2f inches. 
Inhab. North Sea. 
FUSUS Sabini. Gray, Append. Parry, Voy. 
Inhab. North Sea. Like F. Islandicus, but thinner, and whorls much more ventricose. 
FUSUS VENTRICOSUS. 
Shell ovate, fusiform, ventricose, thin, white, covered with a thin olive smooth periostracum, finely 
spirally striated ; spire short, conical, blunt; whorls convex, last ventricose, rounded ; canal rather length- 
ened, slightly twisted. Length 2 inches. Resembles Fusus Sabini in texture, but is much shorter, and 
finer lined. It is also very like Fusus Islandicus, but the spire is not so long as the mouth, and the shell is 
much more ventricose and thinner. 
Inhab. 
FUSUS GLACIALIS. 
Shell ovate, elongated, sub-fusiform, white, solid, closely spirally striated ; spire elongated, longer than 
the mouth ; whorls rounded, convex, with rather close transverse plaits. Mouth ovate ; canal rather elon- 
gated, scarcely twisted ; inner lip slightly thickened. Length 4 inches. 
Inhab. Arctic Ocean. 
FUSUS FORNICATUS. 
Murex fornicatus. Gmel. — List. t. 1057. f. 2 Martini, Concli. iv. f. 1295. 
— Wood, Cat. t. 27. f. 92. 
Inhab. Icy Cape. 
This species offers a very great variety of forms. Most of the young shells have a strong sub-posterior 
keel on each whorl, but as the shell grows this keel disappears, and its place is supplied by more or less 
elevated conical tubercles, which are at first united by a slight ridge, and then become quite free; and some- 
times the older whorls are quite smooth, with only a slight ridge in the place of the keel in the younger 
ones. 
Secondly. Other young shells (or upper whorls of old shells) have two slightly elevated spiral ribs in 
the place of the keel, and the ridges generally become less marked as the shell increases in size. 
Thirdly. Some young shells have two very distinct spiral central keels, the hinder one being generally 
the largest, and sometimes tubercular, and the front of the last whorl being covered by six or seven distinct 
regular spiral ridges. 
Fourthly. Sometimes the spire of the shell is very much elongated, and the whorls smooth, furnished 
with compressed transverse tubercles ; the last whorl is marked with two indistinct sub-central keels, which 
appear to define the length of the tubercles. 
Length 3£ inches ; spire 2 inches. 
In all the varieties the shell varies greatly in the length of the spire, and in the ventricoseness of the last 
whorls. They are all easily known from all the varieties of Fusus despectus, in the canal being more twisted, 
and the shell browner and more horn-like in appearance. 
Fusus PALLI DUS, t. 36./. 14. Brod. ft Sow. Zool. Journ. iv. 378. 
Inhab. Pacific Ocean. 
